Due to my recent post on the size of Mesozoic
birds, I thought I'd estimate the length of every species I could. I
present them here for future reference. As before, non-ornithothoracines
are based on Chiappe et al.'s (1999) Confuciusornis, enantiornithies on Paul's
Cathayornis yandica and euornithines on Hou et al's (1996) Chaoyangia. All
are pretty certainly within 10% of their actual lengths, judging by comparisons
I made using different elements or different reconstructions. Unnamed
specimens were not included, except the Spanish hatchling (Sanz et al.,
1997). Femoral length was used to estimate, or else the only element
known, unless otherwise stated.

82 mm Liaoxiornis

The only specimen complete enough to have an exact
length, though juvenile.85 mm Iberomesornis100 mm Longchengornis105
mm Alexornis

This was based on dorsal length, modified to
include one more vertebra than enantiornithines. The referred specimen is
subequal in length.135 mm Eoenantiornis135 mm Incolornis silvae135
mm Nanantius eos

This was based on scaling N? valifanovi's length
down 30%, as suggested by the differences in tibiotarsal proportions between the
species.140 mm Cuspirostrisornis140 mm Sinornis140 mm Spanish
hatchling

Based on humeral length, which would probably make
this specimen even larger as wings would be comparatively smaller in a
nestling. Note it is bigger than either Iberomesornis or Concornis.
Are they also young specimens? Is this one really a nestling? Was
the adult really big? S many questions....145 mm Largirostornis145
mm Longipteryx150 mm Eoalulavis

Based on femoral diameter, as the taxon has
comparatively longer tibiotarsi and shorter tarsometatarsi than
Cathayornis. That's why I don't use lower limb lengths to estimate.180
mm Confuciusornis dui185 mm Sazavis

Tibiotarsal diameter was used to avoid differences
in lower limb proportions.190 mm Gobipteryx